Chair



Feb. 3,. l925- 1,524,766

J. VAN DEN BOOGAARD A CHAIR Filed July 15', 1921 T OT Patented Feb. 3, 1925. A

UNITED STATES PATENToFFlcE.

JOHN VAN DEN vBOOGrAAQEtD, OF GRAND RAPIDS, MICHIGAN, ASSIGNOR TO AMERICAN SEATING COMPANY, OF GRAND RAPIDS, IWIICHIGAN, A CORPORATION OF NEW JERSEY.

Application led July 15,

l,To all /w/Lom t may' concern.'

Be it known that I, JOHN VAN DEN BOOGAARD, a subject of the Queen of the Netherlands, and residing at Grand Rapids, in the county of Kent and State of Michigan, have invented new and useful Improvements in Chairs, of which the following is a specification.

The present invention relates to chairs; andv its object is, generally, to provide an `improved swivelling support or mounting for a chair; and, more particularly, to provide such a mounting whereby the swivelling movement of the chair when approaching the limit of such movement may be increasingly retarded or cushioned.

This and any other objects hereinafter appearing are attained by, and the invention finds preferable embodiment in, the structure hereinafter particularly described in the body of this specification and illustrated by the accompanying drawings, in whichz- Figure 1 is a top plan view of a chair and a desk, fixed in interrelative positions;

Figure 2 is a view of the same, but showing the chair turned to a different angle relatively to the desk;

Figure 3 is a top plan view of certain of the chair-mounting parts;

Figure 4 is a like view, but showing such parts in an interrelative-ly different angular position;

Figure 5 is a side view of a portion of a chair, showing its mounting parts in axial section taken on a vertical plane corresponding to line 5 5 of Figures 8 and 4; and

Figure 6 is a longitudinal central sectional view of a portion of the base element or standard whereby the chair seat is supported.

When a swivelling chair and a desk intended for use by the same person occupy positions convenient for such use, particularly where such positions are fixed relatively to each other (as in the case of school seats and desks), the turning of the chair on its swivel mounting is likely to cause its back or arm to strike the desk and thus mar them both. If the usual stops are provided to prevent this result, the sudden arresting of the turning movement of the chair thereby causes noise and sometimes a breaking of the parts or a dislocation of the same. The present invention obviates these diffiy CHAIR.

1921. Serial No. 484,917.

. culties by providing means whereby -the turning .movement vof the chair when approaching the limit of such movement Vis increasingly retarded or cushioned.y v

In the vembodiment ofA the invention chosen for illustration by the drawings and for detailed description in the body ofthis specification, the chair 1 (usually positioned fixedly relatively to the desk 2) comprises a base element designated generally?) and a seat element designated generally 4, the seat element being mounted on the base element turnably on a vertical axis. This seatk clement 4 comprises the usual wooden seat with the back 6 and arms 7. VA metallic Vplate 8 fastened, as by screws 9 passing circularly-arcuate edge 14 which in the conf struction shown is disposed toward the desk 2; and the seat elements plate 8 has a depression 15 havinO circularly-arcuate inner side surfaces 16, 1 the base elements plate 12 being located in said depression. The arcuate edge 14 of the base elements plate 12 and the arcuate inner surfaces 16, 17 of the seaty elements plate 8 form surfaces which approach each other toward the back of the seat; this end is effected bythe axis of the arcuate edge 14 of the base elements plate 12 being located nearer the back of the chair than the axis of the arcuate surfaces 16, 17 of the seat elements plate 8. These parts are so interrelatively proportioned and located that, as the seatV element is turned either way toward the limit of its swivelling movement, the arcuate edge or surface 14 of the base element increasingly presses on the surface 16 or 17 (as the case may be) of the seat element, and thus retards and cushions such turning movement; when however the seat element is turned far enough toward the position seen in Figures 1 and 4, these surfaces 14 and 16, 17 separate andthe seat element turns freely. The seat and base elementsv are held together by a flange 20 of the plate 8 extending under and turnably bearing 'on the under side of the plate 12; as shown,

this lflange'rotatably bears :fat 2l on the Epost 11. To provide'a inore axiallyrstable rotary bearing for the seat element, it is'provi'ded With a downwardly extending dished member QQ-having'a rotary bearing 'at -23 on the post l'l. A plate 24 which may be secured, as by bolts passing through oriiices 25,2`Lto the plate 8, turnably bears on the upper surface of the base eleinents'iplate '212. An oiling channel leading to the depression (l5 #is shown'at 26. The platesshowninay be economically ffas'hion'ed by dieing :them from Emetal sheets.

The projections or lugsV 30, B1 'aread'ap'ted to im'utually engage in 'the svvingin'g inove- 'nient 'of the yseatv to positively limit such T1^n`oven`i'entafter the sanef'has beenincreasingly retarded. l

lThe Vinvention being intended to be pointed out inthe'cl'aini, is-not'to be liniited 'to orby details of v'constru'c'ti'on of 'tliefp'aryticula'r embodiment thereof illustrated 'by the y(':lravvings or 4lie'reinlifefore described.

)In a chair; abase element havingV a horizontal-ly disposed plate fixed thereto adjacent itsupper end Vprovided with anarcuate edge; a seat Velement mounted turn'ably on the base element on a vertical a-Xisi'a'nd hav- Iing a flange bearing on said plates under side and an arcuate inner surface eccen- -trical'ly 4disposed relatively to the axis of said plates arcuate edge, said edge and said surface being yadapted `to increasingly 'press member surrounding `'said plate and said 'flange V'and having a rotary (bearing on the base element below said plate, and said flange.

lnte's'tiinony whereof have-hereunto set *my atjGfa'nd Rapids, Michigan, this` 9th dayof Jiily, '1921.

JOHN 'VANDEN BOUGAARD. 

